package com.atguigu.lease.common.utils;

import com.atguigu.lease.common.exception.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;

import javax.crypto.SecretKey;
import java.util.Date;

public class JwtUtil {

    private static long tokenExpiration = 60 * 60 * 1000L;
    private static SecretKey tokenSignKey = Keys.hmacShaKeyFor("M0PKKI6pYGVWWfDZw90a0lTpGYX1d4AQ".getBytes());

    public static String createToken(Long userId, String username) {
        String token = Jwts.builder().
                setSubject("USER_INFO").
                setExpiration(new Date(System.currentTimeMillis() + tokenExpiration)).
                claim("userId", userId).
                claim("username", username).
                signWith(tokenSignKey).
                compact();
        return token;
    }

    public static Claims parseToken(String token) {

        if (token == null) {
            throw new LeaseException(ResultCodeEnum.ADMIN_LOGIN_AUTH);
        }

        try {
            JwtParser jwtParser = Jwts.parserBuilder().setSigningKey(tokenSignKey).build();
            return jwtParser.parseClaimsJws(token).getBody();
        } catch (ExpiredJwtException e) {
            throw new LeaseException(ResultCodeEnum.TOKEN_EXPIRED);
        } catch (JwtException e) {
            throw new LeaseException(ResultCodeEnum.TOKEN_INVALID);
        }
    }

    //生成一个时长比较久的token，来用于接口文档的测试。
    //比较长的token：
    //eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJVU0VSX0lORk8iLCJleHAiOjQ5MDI3NzI0OTUsInVzZXJJZCI6MSwidXNlcm5hbWUiOiJhZG1pbiJ9.EJ75o0jgeeDjtxNXvgd4EgQfbscSisuFg-6au8DZ9eE
/*    public static void main(String[] args) {
        String token = JwtUtil.createToken(1L, "admin");
        System.out.println(token);
    }*/

}